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I have done lots of research and my car is apparently set-up correctly for
HEI after internet investigation and giving various calls to vendors.
I do run my HEI with MSD 6A instead of the module. using the moroso curve
kit & Crane vac adj. kit.
Here is some of the sites I visited most helpful.
www.lectriclimited.com/frequently asked questions.htm
www.oldengine.org/unfaq/hei.htm
Well. I don't have the choke on my 850 demon so that can't be but, I know
the original jets were high 80's front and 90's rear. That really gave me a
rich indication with fuel wash on the plugs. so I went with 74's/ 81's
being the rule of thumb 7 jet sizes from the fronts if using the power
valve. I looked into the 750 demon and that sucker comes with 76's front
and 83's rear. I will try that combo to see where my engine stands and also
reading my plugs color. I think I might have a fuel starvation problem like
you said. You were right my vehicle stalls right off idle to take off. MY
IGNITION HAS BEEN RULED OUT TOTALLY! My car is wired correctly for HEI. :)
1.) It stalls a little when I start it cold.
2.) bogs then go. warm!
3.) I will play with the pump cams possibly one from the dominators since
that's a longer shot! before going to the 50 cc pump
P. Hernandez
68 chevelle
"Rob Thorburn" <[EMAIL PROTECTED]>
Sent by: To:
<[EMAIL PROTECTED]>
[EMAIL PROTECTED] cc:
velles.net Subject: Re: [Chevelle-List]
HEI ???? RESISTENCE WIRE
QUESTION ANYONE?
11/28/2001 01:51 PM
Please respond to
chevelle-list
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Hello:
I have found the best thing with a HEI is to replace the orginal 16
gauge
"coil wire", with a larger diameter 12 gauge wire, back to the connector at
the firewall. I take the wiring harness plug loose at the firewall, pinch
the blade connector and remove it from the harness. Then solder the 12
gauge wire on, and reinstall the blade connector into the harness and bolt
the harness back into place on the firewall.
My guess is: your hesitation is from lack of fuel. Because you have very
low vacuum, you are running out of fuel. The weaker vacuum pulls the fuel
less, so you have to go richer to compensate. When tuning a carb, you have
to trust me, if it falls on it's face, it is 'cause of lack of fuel one
hundred percent of the time! A rich condition will cause a lack of
crispiness in the throttle response and possibility black smoke out the
exhaust, but it would take insane amounts of fuel to kill an engine such as
yours.
First lets discuss the idle: does it tend to stall when you first start
the engine? Are you running a choke? A tendency to stall, without the
choke, when cold is OK, the idle should be set for when the engine is at
running temp. If it idles fine when first starting, it will be too rich
when the engine is up to temp. You can expect fouled plugs from this
setting.
Next, lets talk about the accelerator pump and nozzle. This will sound a
little stupid, but answer this question: Does the car go, then bog, or
does
the car bog then go? My guess is, that the bog is immediate, off idle.
Your engine requires more fuel, and/or it wants it faster. I would also
guess, the nozzle is too small. Try a nozzle in the high thirties. If you
see some improvement, try going higher. On a Holley, you have to purchase a
"Hollow nozzle screw" when going over .042" to prevent flow restriction
problems. If the nozzle screw is center drilled with two side holes you
are
set. Then fine tune the pump circuit with the selection of the pump cam.
You will need to pick a pump cam that gives you a bigger pump shot at the
beginning. If all of that is helping, but you still need more, it will
be
time to purchase the 50cc pump kit. But remember, you only want to use
just
enough fuel to solve the offensive problem. Too much, will give you soggy
performance as the engine has to "clear out". My guess is you are lean on
the jetting too, for peak power, because your motor is more radical than
most street motors.
----- Original Message -----
From: "Paul Hernandez" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, November 28, 2001 10:25 AM
Subject: Re: [Chevelle-List] HEI ???? RESISTENCE WIRE QUESTION ANYONE?
>
> Replies to this message are sent to The Chevelle Mailing List
> ------------------------------------------------------------
>
>
> If the resistance wire was not replaced with a pink or what ever
color
> wire going from the ignition to the HEI, What would be affected and how
can
> you tell the vehicle is having problems.
>
> I currently installed an HEI in my 68 chevelle and the car seems to be
> running fine at idle. I don't have the module but instead I use the MSD6A
> box. Someone help! I'm having hesitation problems while in gear at low
> speeds. I don't think its the Demon carb 850cfm with 74 jets front &
> 81rears, 31 scquirters on my smll blk 355, 11.0:1 555 lift cam. I want
to
> make sure its not the wiring so I can make either timing adjustments or
> carb tuning adjustments. My power valve is a 2.5 since my vacuum is only
at
> 5inches in idle park mode. I also recently changed over to internal
> regulated ALT. and that's been ruled out.
>
> P. Hernandez
> 68 chevelle
>
>
>
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